# chaKra 公式アプリ vs 集中タイマー

The clearest difference is ads: chaKra 公式アプリ at none against 集中タイマー's shown. chaKra 公式アプリ also leads on iOS requirement (12.0 vs 15.0). 集中タイマー's advantage is update cadence (every 9 months vs every 40 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

chaKra 公式アプリ ships an update every 40 months, 集中タイマー every 9 months. The most recent releases landed on September 18, 2026 and August 13, 2026 respectively.

## The numbers

| Metric | chaKra 公式アプリ | 集中タイマー |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 40 months | **Every 9 months** |
| Size | 15 MB | 28 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MIKA OSONOE](https://appshunter.io/developer/1436814575) | [Kousaka Kirino](https://appshunter.io/developer/1037180476) |

## What reviewers say

### chaKra 公式アプリ

[App page](https://appshunter.io/ios/app/chakra/id1436814576)

**In-app purchases:** none


### 集中タイマー

[App page](https://appshunter.io/ios/app/id6446185573)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is chaKra 公式アプリ free?

chaKra 公式アプリ is free to download, with no in-app purchases.

### Is 集中タイマー free?

集中タイマー is free to download, with no in-app purchases.

### Do chaKra 公式アプリ or 集中タイマー have ads?

集中タイマー shows ads; chaKra 公式アプリ does not.

### Which is updated more often, chaKra 公式アプリ or 集中タイマー?

chaKra 公式アプリ ships an update every 40 months, and 集中タイマー every 9 months. Most recently, chaKra 公式アプリ was updated on September 18, 2026 and 集中タイマー on August 13, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*